>>>>> "IK" == Ian Kjos <ikjos@email.uophx.edu> writes:
IK> PS: This is a good argument for pre-object-death destructors
IK> a'la C++. I think resources should be finalized as soon as
IK> they are no longer accessable through other means. I realize
IK> that there are issues to be resolved; perl does it by
IK> following the law of most (!) astonishment. /me dives into
IK> some documentation.
Here's a 5 minute toy example...
-Barry
-------------------- snip snip --------------------/tmp/play.py
class resource:
def __init__(self, resource, func):
self.__resource = resource
self.__func = func
def __call__(self, *args, **kws):
self.__resource.acquire()
try:
rtn = self.__func(*args, **kws)
finally:
self.__resource.release()
return rtn
class FileResource:
def __init__(self, filename):
self._filename = filename
self._fp = None
self.firstbyte = resource(self, self.firstbyte)
def acquire(self):
assert self._fp is None
self._fp = file(self._filename)
def release(self):
assert self._fp is not None
self._fp.close()
self._fp = None
def firstbyte(self):
self._fp.seek(0)
return self._fp.read(1)
fr = FileResource('/tmp/play.py')
print 'firstbyte:', fr.firstbyte()
assert fr._fp is None
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